Mixing properties of binary liquid mixtures of dipropylene glycol dimethyl ether (DPGDME) with 2-propanol, 1-butanol and 2-butanol at different temperatures

Abstract

Densities ρ and speed of sound u for the binary liquid mixtures of dipropylene glycol dimethyl ether (1) + 2-propanol (2), +1-butanol (2) and +2-butanol (2) have been measured at temperatures T = (288.15, 293.15, 298.15, 303.15 and 308.15) K and experimental pressure P = 0.1 MPa over the whole composition range. Experimental densities and speed of sound data has been used to determine excess molar volumes VmE, isentropic compressibility κS, molar isentropic compressibility Ks,m and their excess counterpart excess isentropic compressibility KS, mE at different temperatures. Thermal expansion coefficient along with its excess function has been reported. Deviations in intermolecular free length and deviations in acoustic impedance have also been reported. The variations of the parameters with concentration and temperature have been discussed t have insight into the intermolecular interactions prevailing in the mixtures chosen for the present study.